Datasheet

MAX2057
1300MHz to 2700MHz Variable-Gain
Amplifier with Analog Gain Control
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit with one attenuator connected, V
CC
= +4.75V to +5.25V, T
A
= -40°C to +85°C, f
IN
= 1700MHz to
2500MHz, unless otherwise noted. Typical values are at V
CC
= +5.0V, R1 = 1.2kΩ, R2 = 2kΩ, P
OUT
= +5dBm, f
IN
= 2100MHz,
V
CNTL
= 1V, 50Ω system impedance, second attenuator is not connected, T
A
= +25°C, unless otherwise noted.) (Note 3)
Note 1: Total supply current reduces as R
1
and R
2
are increased.
Note 2: Operating outside this range for extended periods may affect device reliability. Limit pin input current to 40mA when V
CC
is not present.
Note 3: Operation outside this range is possible, but with degraded performance of some parameters.
Note 4: All limits include external component losses, unless otherwise noted.
Note 5: Noise figure increases by approximately 1dB for every 1dB of gain reduction.
Note 6: f
1
= 2100MHz, f
2
= 2101MHz, +5dBm/tone at OUT.
Note 7: Switching time is measured from 50% of the control signal to when the RF output settles to ±1dB.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reverse Isolation 37 dB
Noise Figure (Note 5) 6 dB
Output 1dB Compression Point +23.8 dBm
Output 2nd-Order Intercept Point
From maximum gain to 15dB attenuation, measured at
f
1
+ f
2
(Note 6)
+64 dBm
Output 3rd-Order Intercept Point From maximum gain to 15dB attenuation (Note 5) +37 dBm
T
A
= +25°C to +85°C -0.83
Output 3rd-Order Intercept Point
Variation Over Temperature
T
A
= +25°C to -40°C -0.6
dB
2nd Harmonic From maximum gain to 15dB attenuation, P
OUT
= +5dBm -65 dBc
3rd Harmonic From maximum gain to 15dB attenuation, P
OUT
= +5dBm -83 dBc
One attenuator 17 20.7
f
IN
= 1700MHz to 2200MHz,
V
CNTL
= 1V to 4V
Two attenuators 34 42.4
One attenuator 17 22
RF Gain-Control Range
f
IN
= 1450MHz to 1560MHz,
V
CNTL
= 1V to 4V
Two attenuators 34 44
dB
RF Gain-Control Slope V
CNTL
= 1.8V to 3.5V -10 dB/V
Maximum RF Gain-Control Slope Maximum slope vs. gain-control voltage -15.2 dB/V
Gain Flatness Over
100MHz Bandwidth
Peak-to-peak for all settings 0.5 dB
Attenuator Switching Time 15dB attenuation change (Note 7) 500 ns
Attenuator Insertion Loss Second attenuator (IN_A, OUT_A) 2.2 dB
Input Return Loss Entire band, all gain settings 18 dB
Output Return Loss Entire band, all gain settings 15 dB
Group Delay Input/output 50 lines de-embedded 300 ps
Group Delay Flatness Over
100MHz Bandwidth
Peak to peak 20 ps
Group Delay Change vs. Gain
Control
V
CNTL
= 1V to 4V -70 ps
Insertion Phase Change vs. Gain
Control
V
CNTL
= 1V to 4V 50 degrees